Super agent Jorge Mendes is trying to convince Diego Costa to consider making a move to AC Milan in the final month of the transfer window.
Costa, valued at around £50 million ($65.39m) by Chelsea, would prefer a move back to Atletico, while AC Milan are also reported to be interested, but his former club are now subject to a transfer embargo until January 2018.
Cardoso claimed the "unfair behaviour of Antonio Conte makes it impossible (for Costa) to return to the English club".
The striker is apparently keen to rejoin his former club Atletico Madrid, but with the Spanish side now serving a transfer ban, this seems an unlikely move.
The 28-year-old has made 120 appearances for London club so far, scoring 58 goals in all competitions.
And Italian outlet Calciomercato claim Costa's agent Jorge Mendes is trying to convince the Spain worldwide that Milan is a good fit.
"And he will not play for any other club which is not Atletico Madrid, a club where he had sporting success, but above all where he was always respected, even after he had joined Chelsea".
He would be able to sign for them now, be loaned out for six months, before finally being able to play for the La Liga side once their transfer ban is over.
Asked what he told Costa during the game at an Arsenal Q&A event, Holding said: "An expletive, then I just called him a nutter basically".
"I won't speak about him now".
"Going back three or four years when Liverpool were in for Costa, I think we offered 20 million".
"It was £25m and the deal never got done".
"You love these players". Good skills too. Good technique.
'It didn't matter whether you were playing against Hull City or Manchester United, you knew what you'd get off Costa'.